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A summary on Polarisation in Run-13 for 255 geV

A summary on Polarisation in Run-13 for 255 geV. E.C. Aschenauer presenting the work done By Bill, DIMA and OLEG . 2012: H-Jet Results. H-Jet Results. polarisation for Blue and Yellow t o -calibration underway minimal impact on polarization, makes A N more stable

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A summary on Polarisation in Run-13 for 255 geV

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  1. A summary on Polarisation in Run-13for 255 geV E.C. Aschenauer presenting the work done By Bill, DIMA and OLEG

  2. 2012: H-Jet Results 2013/03/13

  3. H-Jet Results • polarisation for • Blue and Yellow • to-calibration underway • minimal impact on • polarization, • makes AN more stable • should be done by • tomorrow •  next step calibrate pC 2013/03/13

  4. pC Results • Caveat: not yet normalized to jet – simple reason need statistics • Note: • measured analyzing power for injection, 100GeV and 255 GeV in run 11/12 • have not seen an energy dependence of pC/H-jet normalization •  can use the same normalization factor for flat top and injection • so injection measurements will be pretty accurate • fillsshown in all plots: 17085—17208 for B1 and Y1 Injection 2013/03/13

  5. pC Results at flat top 2013/03/13

  6. Hadron Polarisation for Experiments Account for beam polarization decay through fill  P(t)=P0exp(-t/tp) growth of beam polarization profile R through fill pCarbon polarimeter Collider Experiments x=x0 correlation of dP/dt to dR/dt for all 2012 fills at 250 GeV • Polarization lifetime has consequences for physics analysis • different physics triggers mix over fill •  different <P> 2013/03/13

  7. pC Results: profile R at injection 2012: 0.054+/-0.0104 at flat top 2012: 0.133+/-0.009 2013/03/13

  8. pC Results: profile R at injection 2012: 0.038+/-0.014 at flat top 2012: 0.205+/-0.011 2013/03/13

  9. pC Results: Polarisation Decay 2012: -0.61+/-0.056 2012: -0.67+/-0.056 2013/03/13

  10. Our Worries Target Death Rate • Use factor 2 thicker targets compared to 2012 • but still high death rate Fill    Date   Time   Energy    B1   B2  Y1  Y2   -----------------------------------------------   17208   03/11  18:43  27       H5   17208   03/11  18:47  27       H2   17208   03/11  18:47  27       H4   17205   03/11  6:39   255                    V5 17203   03/11  21:59  255      H1 H3  V3   17114   02/26  16:31  27       H6   17172   03/05  18:43  255           V5 17169   03/05   4:20  255           V3 H1   17134   03/01  23:33  255           V1   17121   02/27  18:55  27                    V1 17209 03/12 05:08 255 V4   Remaining Targets:   ==================   B1: 0 horizontal and 6 vertical   B2: 6 horizontal and 0 vertical   Y1: 4 horizontal and 6 vertical   Y2: 6 horizontal and 2 vertical Will have to replace targets at one of the next access

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